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-1 byte thanks to @Jonathan Allan
f=lambda n,A:n>0and sumn>=0and(n<1)+sum(f(n-x,A)for x in A)or n==0
Try it online!Try it online!
f=lambda n,A:n>0and sum(f(n-x,A)for x in A)or n==0
Try it online!
f=lambda n,A:n>=0and(n<1)+sum(f(n-x,A)for x in A)
